Hi, Trying (again) to use Boost.Geometry with coordinates with Boost.Units (BTW, what is the status of the compatibility between geometry and units?) I found the following macro definition in boost/ geometry/geometries/adapted/boost_fusion.hpp // Convenience registration macro to bind a Fusion sequence to a CS #define BOOST_GEOMETRY_REGISTER_BOOST_FUSION_CS(CoordinateSystem) \ namespace boost { namespace geometry { namespace traits { \ template <typename Sequence> \ struct coordinate_system \ < \ Sequence, \ typename boost::enable_if \ < \ fusion_adapt_detail::is_fusion_sequence<Sequence> \ >::type \ > \ { typedef cs::cartesian type; }; \ }}} Unless I am missing something, the definition of the macro does not depend on the parameter "CoordinateSystem" !. To make the situation even more confusing the manual's example (http://www.boost.org/doc/ libs/1_47_0/libs/geometry/doc/html/geometry/reference/adapted/ boost_fusion.html) uses the struct as the parameter and not the coordinate system ! Unless I am wrong the last lines of the definition of BOOST_GEOMETRY_REGISTER_BOOST_FUSION_CS should be: { typedef CoordinateSystem type; }; \ }}} and the manual should be updated accordingly. E.g. the example should read BOOST_FUSION_ADAPT_STRUCT(sample_point, (double, x) (double, y) (double, z)) BOOST_GEOMETRY_REGISTER_BOOST_FUSION_CS(cs::cartesian) Am I missing something? Thanks, Alfredo